(re McAdoo, PA slang) likely to be a form of "goomba' ", which is Sicilian pronunciation of compadre (sp?) meaning godfather (yes the mafia term). "Goomba' " in the US evolved into a colloqualism for buddy.

McAdoo and nearby Hazleton have large Southern Italian populations and had notable mob presence during the early-mid 20th century.

Hey Kumba! (then 2nd person says "Kumba!"...) Wanna get a few quarts? I'll be out the back and gettin' the car.